Read the pattern
Compare hot and cold at several fixtures, simultaneous demand, time of day, neighbors, meter or service work, visible leaks, aerators, and suitable static and flowing measurements.
Decision terrace 15
Move from evidence to a bounded authorization
Hold the safety line
Use gauges and controls only as intended. Do not adjust a regulator, pump, fire connection, or backflow assembly from one reading or compensate by defeating a safety device.
Place the Seattle boundary
SPU's private-line rules address regulators when static pressure is above the code threshold; low-pressure diagnosis still needs current service data and property measurements rather than an old planning claim.
Write the visit
Require test points, demand conditions, fixture restrictions, service-line context, leak screening, regulator or booster evaluation, public handoff, repair, and comparable post-work readings.
Keep the closing evidence
Repeat measurements at the same outlets and demand states, then record settings, replaced components, unresolved public conditions, and the operating range explained to occupants.
Current public source